Process of making aluminium paint.



UNITED STATES PATENT OFFICE.

LEONHARDT OTT AND HANS RIFFELMAOHER, OF BOTH, GERMANY, ASSIGNORS TO THEBRONZEFARBENWERKE AOTIEN GESELLSOHAFT, VORMALS CARL SCHLENK, OF SAMEPLACE.

PROCESS OF MAKING ALUMINIUM PAINT.

SPECIFICATION forming part of Letters Patent No. 642,358, dated January;30, 1900.

Application. filed July 21, 1899. Serial No, 724,712. (No specimens) Toall whom it may concern:

Be it known that we, LEONHARDT OTT and HANS RIFFELMAOHER, subjects ofthe Emperor of Germany, and residents of Both, in the Kingdom of BavariaandGerman Empire, have invented certain new and useful Improvements inMethods or Processes of Manufacturing Aluminium Powder, of which thefollowing is a full, clear, and exact specification.

Hitherto aluminium powder has generally; been made by rolling cast rodsout into leaves after repeated glowing or heating and then stamping theleaf metal. Experiments have also been made with waste filings, &c., butthese experiments have thus far had no good resultbecause the powder wasnot soft enough.

The present invention is based on the observation that thin-walledbodies of aluminium which are produced when liquid aluminium is pouredinto water are suitable to be comminuted directly into powder bystamping, and this powder leaves nothing to be desired as to softnessand ductility. In producing it according to our discovery we pour theliquid aluminium into water, which causes it to solidify in irregularforms of extreme thinness. These small or thin pieces are then broughtunder a stamping-press of ordinary construction or similar comminutingapparatus, whereby they are converted into a fine powder. 7

By the above process the lengthy preliminary operations usuallyrequired, necessitat ing skilled operators, are dispensed with.

Having thus described our invention, what we claim is-- Theherein-described process of producing aluminium powder consistinginpouring fluid aluminium into water and then comminuting the thinirregular-shaped pieces so formed, substantially as described.

In testimony that we claim the foregoing as our invention we have'signed our names in presence of two subscribing witnesses.

LEONI-IARDT OTT. HANS RIFFELMAOHER.

Witnesses:

JULIUS GERTERBEIN, ERNST EISENBERG.

